CN1977479A - Method for clear channel assessment optimization in a wireless local area network - Google Patents

Method for clear channel assessment optimization in a wireless local area network Download PDF

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Publication number
CN1977479A
CN1977479A CNA2005800017482A CN200580001748A CN1977479A CN 1977479 A CN1977479 A CN 1977479A CN A2005800017482 A CNA2005800017482 A CN A2005800017482A CN 200580001748 A CN200580001748 A CN 200580001748A CN 1977479 A CN1977479 A CN 1977479A
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platform
parameter
channel assessment
access point
wash rice
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CN1977479B (en
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克里斯多福·凯夫
安森·罗伊
保罗·马里内尔
安吉罗·卡费洛
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InterDigital Technology Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/024—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Inorganic Chemistry (AREA)
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  • Small-Scale Networks (AREA)

Abstract

A method for optimizing clear channel assessment (CCA) parameters in a wireless local area network having an access point (AP) and at least one station begins by receiving a trigger condition. An upper bound and a lower bound for an energy detect threshold (EDT) parameter are determined. A value of the EDT parameter is calculated and is bound by the upper bound and the lower bound. Lastly, the EDT parameter is updated. The method can be performed at each station or at the AP, with the updated CCA parameters being signaled to each station associated with the AP.

Description

Method for clear channel assessment optimization in the WLAN (wireless local area network)
Technical field
The relevant WLAN (wireless local area network) (WLANs) that the present invention is total, and more especially, the method for clear wash rice channel assessment parameter among the relevant optimization WLAN.
Background technology
In wlan system, decentralized coordinating formula function (DCF) is in the basic access technique of formula benchmark asynchronous data transfer of doing the best.Use WLAN (wireless local area network) decentralized coordinating formula functional mode to support promoting of the competitive mode service of all platforms, be used to reach the multiple access mechanism of this purpose for having the carrier sense multiple access (CSMA/CA) that collision is avoided to the fair access of this channel.Whether busy platform detect channel a kind of mode for by analyzing all packages and by detect the activity at channel via the relative signal intensity from other source after testing that transmit from other WLAN user.The entity carrier sense of carrying out before data transmit is called wash rice channel assessment (CCA) clearly.
Clear wash rice channel assessment is used for the transmission and the reception of the package of 802.11 devices.Before data transmitted, device must be by using clear wash rice channel assessment to guarantee that wireless medium is idle.Data are received, and this installs the package that sensing only meets the clear wash rice channel assessment criterion of busy channel.
802.11 the clear wash rice channel assessment pattern that standard definition is different, the normal clear wash rice channel assessment pattern of using need be pardoned and limits (EDT) for being higher than energy measuring for carrier sense before busy and energy at the report media.More specifically say to have energy busy media of clear wash rice channel assessment report when being higher than energy measuring and pardoning the wireless lan signal form of limit in detection, other clear wash rice channel assessment pattern only requires carrier sense, or only requiring energy to be higher than energy measuring pardons limit.
Single energy detects limits the transmission that is used for tuning package on the parameter typical case and the clear wash rice channel assessment of reception for this reason, and clear wash rice channel assessment is good tuning working as to be used for transmission:
1) when the platform from its basic service set (BSS) transmits package, access point (AP) always sensing channel is busy.
2) to transmit platform so far because the package of the device of comfortable contiguous basic service set transmits also sensing channel for busy when the tool package, access point always the sensing channel for busy.By satisfying this condition, access point is passed slowly and can be caused the outside package that transmits mistake.
3) will transmit so far platform sensing channel for idle when having package, access point always sensing channel be idle, is using this channel even be close to the device of basic service set certainly.By satisfying this condition, can avoid unnecessary passing slowly.
On the other hand, clear wash rice channel assessment is good tuning working as to be used for receiving:
1) access point can be received from the package of all platforms in the coverage area of its basic service set, if energy measuring limits parameter setting too high for this reason, access point may not receive by the package that platform transmitted that is positioned at this cell edge.
2) access point can the comfortable package that is close to the device of basic service set of sensing.If energy measuring limits parameter setting low excessively for this reason, access point may " carrier locking " in by be positioned at outside its basic service set platform transmitted or by package that other access point transmitted.Transmit because of " locking " is outside, access point can miss any transmission of the platform of comfortable its own basic service set.This kind incident can cause packet error, because the outside packet collision that can receive with access point from the package of the platform of its own basic service set.
Determine the ideal capacity detection to limit setting to be included in trading off between transmission of optimization package and the reception of optimization package for this reason, and, adjust dynamic approach that energy measuring limits parameter for this reason for need to adapt to variety of network conditions (as variation) in the basic service set size.
Summary of the invention
Have access point and the WLAN (wireless local area network) of at least one non--access point platform in three kinds of methods of the clear wash rice channel assessment of optimization parameter narrated." clear wash rice channel assessment parameters " is in being to be used for collective to represent that clear wash rice channel assessment pattern and energy measuring limit the value of parameter for this reason herein for title.
First method need be between platform, or any specific signalling between platform and access point, and in the method, each platform or access point attempt find that based on some statistics the best of its own clear wash rice channel assessment parameter sets independently.Between platform and access point without any sharing about the information of clear wash rice channel assessment parameter setting.The method begins by receiving trigger condition, the decision energy measuring is limit the upper limit and the lower limit of parameter for this reason, energy measuring limits the value of parameter to be calculated and by this upper limit and this lower limit for this reason, at last, upgrade energy measuring and limit parameter for this reason, this method can be carried out at any one platform, all platforms or at access point.
Second method need signaled between platform or between platform and access point, to communicate by letter by platform or the employed clear wash rice channel assessment parameter value of access point.In the method, each node (platform or access point) has the chance of knowing about by other platform or the employed clear wash rice channel assessment parameter value of access point, but node also can only be revised his clear wash rice channel assessment parameter.This second method with platform or other platform of access point request and/or access point report at present employed clear wash rice channel assessment parameter value begin, through request platform and/or access point with these value reportings to asking platform or access point, request platform or access point are followed the calculating optimum value to be used as its oneself clear wash rice channel assessment parameter.After this calculated, request platform or access point can change its own clear wash rice channel assessment parameter value and reach, and optionally, this new value of signaling is to other platform or access point.
The third method need signaled between platform or between platform and access point, and this makes a platform or access point can revise by other platform or the employed clear wash rice channel assessment parameter value of access point.In this third method, node can determine itself and set in the best of the clear wash rice channel assessment parameter of other node of this system, and can ask other node with their the clear wash rice channel assessment of the indivedual the bests parameter of use by this requesting node was determined.In structure, basic service set comprises perhaps multistation platform of an access point and, and requesting node should be preferably access point.The best that the method is calculated the one or more platforms relevant with access point with access point wash rice channel assessment parameter clearly begins, and this calculating can (or can not) be with identical in the employed calculating of first method.After the decision of the best clear wash rice channel assessment parameter of each platform, this access point signals the individual values of the clear wash rice channel assessment of this best parameter to each platform, platform decision parameter whether be success or failure possible and show this change in response message through the request change to this access point.
The access point of the clear wash rice channel assessment of optimization parameter comprises receiver, energy detector, channel availability determination device, reaches clear wash rice channel assessment calculation element in having the WLAN (wireless local area network) of at least one platform, and clear wash rice channel assessment calculation element receives input parameter and calculates this clear wash rice channel assessment parameter from this access point.
The platform of the clear wash rice channel assessment of optimization parameter comprises receiver, energy detector, channel availability determination device, reaches clear wash rice channel assessment calculation element in having the WLAN (wireless local area network) of access point, and clear wash rice channel assessment calculation element receives input parameter and calculates this clear wash rice channel assessment parameter from this platform.
The integrated circuit of the clear wash rice channel assessment of optimization parameter comprises receiver, energy detector, channel availability determination device, reaches clear wash rice channel assessment calculation element in WLAN (wireless local area network), and clear wash rice channel assessment calculation element receives input parameter and calculates this clear wash rice channel assessment parameter.
Description of drawings
More detail knowledge of the present invention can be obtained by the following explanation as the preferred embodiment of example, and can understand jointly with relevant drawings, wherein:
Fig. 1 limits the flow chart of optimization method for this reason for the energy measuring of the first method according to the present invention;
Fig. 2 is the calcspar of the device of specific method shown in Figure 1;
Fig. 3 is presented to signal between access point or platform and another access point or platform to carry out the figure of the second method according to the present invention; And
Fig. 4 is presented between access point and platform to signal to carry out the figure of the third method according to the present invention.
Embodiment
The present invention illustrates that a kind of method limits parameter for this reason with the energy measuring that optimization dynamically is used for the clear wash rice channel assessment of wireless local area network (WLAN) system.
Table 1-parameter-definition
Symbol/title Explanation
The T cycle The basic cycle in triggered time
P AP The access point delivering power
P STA The platform delivering power
RS AP The access point receiver sensitivity
RNG Substrate The baseline scope of access point, this baseline scope is stipulated the covering scope by the access point service, and the baseline scope can be artificial configuration or dynamically determined by access point during system operation
N TX Through transmitting the calculated package number of packet error
N RX Through receiving the calculated package number of packet error
PER Tx max The target maximum is through transmitting packet error
PER Rx max The target maximum is through receiving packet error
DR MAX The target maximum is passed rate slowly
α Through receiving the weight factor of packet error
β Through transmitting the weight factor of packet error
γ Slowly pass the weight factor of rate
Δ Energy measuring is limit basic step for this reason
Table 2-measures definition
Symbol/title Explanation
PER Tx Through transmitting packet error, this Department of Survey uses N TxThe sliding window that transmits package at last calculates
PER Rx Through receiving packet error, this Department of Survey uses N RxThe sliding window that receives package at last calculates
DR Slowly at least one will transmit the percentile measurement of time of package to pass this carrier that is locked by the outer package of basic service set for the expression access point of rate and tool
The flowchart text of the clear wash rice channel assessment optimization method 100 of use first method according to the present invention is in Fig. 1, and method 100 can be applicable to access point and indivedual platform, and this clear wash rice channel assessment optimization method emphasizes that energy measuring pardons the decision of the right position standard of limit.Set preferably that this clear wash rice channel assessment pattern makes and pardon limit and cognitive radio local area network signal then it shows busy if this is higher than energy measuring through received signal.Perhaps, can set that this clear wash rice channel assessment pattern makes pardoned limit then it showed busy if only should be higher than energy measuring through received signal.
Trigger
Energy measuring is limit optimization method 100 any triggering in following condition for this reason:
1. PER Tx > PER Tx max And from last energy measuring pardon limit upgrade after N at least TXIndividual package is transmitted.
2. PER Rx > PER Rx max And from last energy measuring pardon limit upgrade after N at least RXIndividual package is received.
3. the cycle is triggered the time termination of timer, that is T Disappear＞T Cycle, and from last energy measuring pardon limit upgrade after N at least TXIndividual package has been transmitted and N at least RXIndividual package is received, T DisappearFor pardon the elapsed time after limit is upgraded from last energy measuring.
When triggering according to condition 1, optimization method 100 attempts solve the not enough problem of passing slowly, set because too high energy measuring is pardoned limit in that of descending (DL) extra packet error is former; When platform transmitted for being locked in contiguous basic service set, access point can the sensing channel be not busy, uses minimized number really to exist to guarantee problem through transmitting package.
When triggering according to condition 2, optimization method 100 attempts solve excessively sensitive access point problem, set because too low energy measuring is pardoned limit in that of up (UL) extra packet error is former; The access point carrier latch makes it miss the package from its platform due to contiguous basic service set package.Up packet error generally betide when platform transmit a package and access point carrier latch when contiguous basic service set transmits.Use minimized number really to exist to guarantee problem through receiving package.
Condition 3 is to be used for general optimization purpose, and optimization method 100 triggers termly, in case enough packages are transmitted and receive to collect enough statistics.
Should select trigger parameter to make the fast reaction of 100 pairs of too much packet error situations of optimization method.For example, in case to collect enough statistics, optimization method 100 answers per second once regularly to trigger.If trigger the minimum value that needs 100 packages, then 10% error rate produces 10 mistakes.
The decision energy measuring is pardoned the limit scope
Optimization method 100 limits going up of parameter for this reason by the decision energy measuring and lower limit begins (step 102), and energy measuring is limit the upper limit of parameter for this reason, and energy measuring is pardoned limit MAX, be that decision is as follows:
Energy measuring is pardoned limit MAX=P Platform-(RNG Base+ RNG Adj) equation (1)
RNG wherein AdjFor by the scope adjusted value that power control algorithm determined, should set energy measuring and limit parameter to make access point can detect all packages at least for this reason from itself basic service set, energy measuring is pardoned limit MAXCorresponding to the signal level that receives from the transmission of the platform that is positioned at this cell edge.
Energy measuring is pardoned limit as calculated MAXValue compares with the maximum that is allowed by 802.11 standards, and adopts the junior of these two values, is detected by the ceiling capacity that this standard allowed and pardons the delivering power that limit value is based on access point, P APEnergy measuring is pardoned limit MAXDynamically calculate because RNG Base, RNG Adj, and P STACan revise in any time by power control algorithm, and no matter when exist RNG Base, RNG Adj, or P STAChange can upgrade energy measuring and pardon limit MAX
Energy measuring is limit the lower limit of parameter for this reason, and energy measuring is pardoned limit MIN, be set at access point receiver sensitivity position standard, RS AP
Energy measuring is pardoned limit and is upgraded
Then, energy measuring is pardoned limit (EDT) parameter by based on its existing value, through receiving and through transmitting packet error, reaching and pass rate slowly and calculate (step 104):
EDT = EDT + [ α PER Rx PER Rx MAX - β PER Tx PER Tx MAX + γ DR DR MAX ] Δ Equation (2)
The default value of weight factor is 1, and can be based on system development (that is, the configuration of access point and platform) and optimization.
Between last and lower limit, adjust energy measuring and pardon limit (EDT) parameter (step 106):
EDT=max (EDT MIN, min (EDT MAX, EDT)) and equation (3)
Upgrade energy measuring and pardon limit value (step 108) and this method end (step 110), notice that after calling for the last time of optimization method 100 limit in the energy detection for this reason whether channel taking place changes, energy measuring limits parameter to be automatically made energy measuring limit for this reason for this reason MIN
Perhaps, may use different energy measuring to limit parameter setting for this reason in transmitting and receiving.The optimization energy measuring is pardoned limit TxTransmit to be used for package, and the optimization energy measuring is pardoned limit RxReceive to be used for package.Before transmitting package, access point is set clear wash rice channel assessment energy measuring immediately, and to limit parameter for this reason be that energy measuring is pardoned limit Tx, and in case data transmit to finish and are set resilience and detect and pardon limit Rx
Energy measuring is pardoned limit TxBe to use to be similar to step decision shown in Figure 1, except using following formula:
Equation (4)
Then between last and lower limit, adjust energy measuring and pardon limit Tx, shown in equation (3).
In a specific embodiment, energy measuring is pardoned limit Rx=RNG Base, in another specific embodiment, energy measuring is pardoned limit RxSet according to following equation:
Figure A20058000174800111
Equation (5)
Fig. 2 shows access point or the platform of setting up according to the present invention 200, this access point or platform 200 comprise the receiver 202 that is connected to energy detector 204, and channel availability determination device 206 is to be connected to energy detector 204 and clear wash rice channel assessment calculation element 208 is to be connected to this channel availability determination device 206.This clear wash rice channel assessment calculation element 208 receives parameter, as DR and PER, pardon limit value to this channel availability determination device 206 as input and output energy measuring, whether it uses energy measuring to pardon limit value busy with the decision channel, energy measuring is pardoned limit value and also is circulated back to this clear wash rice channel assessment calculation element 208, and is to use shown in equation 2 and 3.
Use second method clear wash rice channel assessment optimization method 300 be illustrated at Fig. 3, the method can be used by any platform or access point, use the platform of this method or access point to be called " optimization " platform 302.Optimization platform 302 request has many kind possibility methods to carry out this signalling about the information (step 310) at the clear wash rice channel assessment parameter setting of other platform or access point 304.
First kind of possibility method is that to transmit indivedual requests (single-point propagations) platform or their address of access point 304 (" through requiring platform ") around each be that this optimization platform 302 is known to optimization platform 302, optimization platform 302 can be known these addresses by different modes, for example, if this optimization platform 302 is an access point, it must know the address of following in its all platforms, if this optimization platform 302 is a platform, it can know the address at other platform of same basic services set by noting the MAC Address through receiving package, yet protocol of wireless local area network may not allow the direct communication between the platform of basic service set in structure.In the case, the method is for only access point is spendable.
This request must comprise that this optimization platform 302 and this are through requiring the address of platform 304.In 802.11 WLAN (wireless local area network), this information is in the MAC gauge outfit, optionally, this request can comprise this time restriction through requiring platform 304 to respond, and this passback immediately after requiring platform 304 just to comprise the correct reception of package of request confirms to reply (as any other package that is directed to specific platform).In this way, this optimization platform 302 knows that this suitably receives this request through requiring platform 304, and if in sometime not confirmation of receipt reply then through requiring platform 304 can transmit the package that comprises this request again.
Second kind of possibility method is that optimization platform 302 transmits all general requests of platform 304 on every side that are directed to, this can be finished by the broadcast message that transmits the identification code of only stipulating basic service set, only belonging to this platform through specifying basic service set in the case can respond, this also can by transmission stipulate all platforms (wishing to have thus) through reporting clear wash rice channel assessment parameter the address the multiple spot message and finish.
In the third possibility method, the clear wash rice channel assessment parameter of one or more platform of this access point is followed in the access point acquisition that platform (non--access point) can ask this platform to be followed, but not directly by this platform required parameter, this request can comprise wishes that tool is through reporting the platform address of clear wash rice channel assessment parameter thus, or all requested special sign of clear wash rice channel assessment parameter of all platforms of comfortable this basic service set of demonstration, after this request, access point can be through requiring the clear wash rice channel assessment parameter response of platform 304.Access point can have this information, or before this optimization platform 302 of response, and it may need to ask this information (use mechanism mentioned above one of them) from platform.
To successfully receiving any platform of clear wash rice channel assessment parameter request according to one of them of mechanism mentioned above, platform reads the value (step 312) of employed at that time clear wash rice channel assessment parameter, and these values (clear wash rice channel assessment pattern and energy measuring are pardoned limit) can normally be found in this management information base (MIB) through requiring platform 304.After reading this clear wash rice channel assessment parameter, this transmits clear wash rice channel assessment parameter report (step 314) through requiring platform 304 (obtaining to the access of this media according to 802.11 general agreements), this report can be transmitted to all platforms at this basic service set (do not expect in the case that any affirmation reply), or, being preferably the single-point that can be in 302 guidings of this optimization platform propagates, under latter instance, wish to obtain confirming to reply and should can under the situation of failure, transmitting again through requiring platform 304 from this optimization platform 302.This report comprises the value of wash rice channel assessment parameter clearly.
In case this optimization platform 302 be received from all clear wash rice channel assessment parameter reports through requiring platform 304 (or after request transmits certainly through behind the interval sometime, decide in its sole discretion by this optimization platform 302), the new clear wash rice channel assessment parameter (step 316) that these optimization platform 302 calculating itself are used.
The straightforward procedure that determines clear wash rice channel assessment parameter for the sensitiveest platform that uses clear wash rice channel assessment parameter to receive thus (that is, the tool minimum energy detects the platform limit parameter setting for this reason) clear wash rice channel assessment parameter, if path loss information can provide, energy measuring limits parameter can be calculated as with sensitive as the sensitiveest report platform for this reason, for example, access point can be set its energy measuring and limits parameter to make it transmit to external world as sensitive as its sensitiveest platform for this reason.Access point can limit parameter to limit parameter to equal less to reach this purpose to the amount of the difference of the path loss of main external intervention device for this reason than the energy measuring of this sensitivity platform by setting its energy measuring for this reason.
After this optimization platform 302 had calculated its new clear wash rice channel assessment parameter that should use, it can use this new setting immediately.Optionally, its can transmit clear wash rice channel assessment parameter notice to other through requiring platform 304 to notify them now by these optimization platform 302 employed new settings (step 318).This information can be led to specific platform (single-point propagation) or a plurality of platform (multi-point diffusion or broadcasting).
Use the Fig. 4 that is illustrated at of the clear wash rice channel assessment optimization method 400 of the third method to be, the access point that the method is preferably by basic service set in structure uses, and does not use (as in independent based services set) though do not get rid of by non--access point platform." control " platform 402 that uses the access point of this method to be called, control platform 402 calculate or set up and be used for itself and at other platform (" through control " platform 404 of same basic services set; Step 410) best clear wash rice channel assessment parameter, this decision can or can not use method 100 mentioned above to carry out.
After the best clear wash rice channel assessment parameter of each platform of decision (according to algorithm, these parameters through control platform 404 can or can be not different with another), this revises their clear wash rice channel assessment parameter (" clear wash rice channel assessment parameter control request " these control platform 402 requests through control platform 404; Step 412).If all clear wash rice channel assessment parameters through control platform 404 are identical, then this control platform 402 can transmit the broadcast message that comprises the basic service set identification code with the value of clear wash rice channel assessment parameter, and optionally response time restriction.It also can follow clearly, and the value of wash rice channel assessment parameter transmits the multi-point diffusion information that comprise all addresses through controlling platform 404.Be preferably, this control platform 402 transmit respectively single-point propagate (tool is confirmed to reply) to each of its new clear wash rice channel assessment parameter of tool through control platform 404.When one through the new clear wash rice channel assessment parameter of control platform 404 and another not simultaneously, multi-point diffusion or single-point diffuse information to compulsory.
After successfully receiving clear wash rice channel assessment parameter control request information, whether may use this new clear wash rice channel assessment parameter (step 414) that this control platform 402 is asked through 404 decisions of control platform, according to this capacity through control platform 404 (for example being somebody's turn to do through asking the radio frequency sensitivity or the availability of clear wash rice channel assessment pattern), using this new parameter may be for impossible.If this is modified to possible, this through control platform 404 revise its clear wash rice channel assessment parameter (step 416) immediately and transmit response (" clear wash rice channel assessment parameter control response ") as single-point diffuse information to control platform 402 (preferable) or as broadcast message to all platforms (step 418) at this basic service set, this information comprises the success that shows this clear wash rice channel assessment parameter correction or the sign of failure.Under failure scenarios, this information optionally comprises " reason " field that failure cause (as the clear wash rice channel assessment pattern that can't provide or pardon limit value and cross low or too high through the request energy measuring) is provided, and it also can comprise at that time by this value through control platform 404 employed clear wash rice channel assessment parameters.
Certainly all through control platform 404 receive the response back (or after request transmits certainly through behind the interval sometime, decide in its sole discretion by this control platform 402), in a kind of mode that is determined in this method 100 that is similar to, this control platform 402 can determine anything not do the next one up to optimized algorithm through the scheduling activity.Return under the situation of response through control platform 404 at some, what this control platform 402 also can determine repetitive requests is sent to this through controlling platform 404.
Though the present invention is about the WLAN (wireless local area network) explanation in herein, principle of the present invention can be applicable to the wireless communication system of other form, in such cases, platform can comprise, but be not limited to, as the device of wireless transmission/receiving element (WTRU), subscriber equipment, fixing or moving user unit, beeper, or can be at the device of any other pattern of wireless environment operation.Similarly, this access point can include, but not limited to as the device of base station, B-node, address control unit, access point or at the contact-making surface device of any other pattern of wireless environment.
Though feature of the present invention and assembly system is illustrated in preferred embodiment with special compound mode, each feature or assembly can use (the not further feature of this preferred embodiment of tool and assembly) separately or with various tools or being used in combination of further feature of the present invention and assembly of not having.Though certain specific embodiments of the present invention illustrates and illustrates, some improvement and change and can be undertaken and do not depart from the scope of the invention by knowing the present technique personnel, more than explanation is to be used for explanation and the special invention of restriction never in any form.

Claims (25)

1. the method for the clear wash rice channel assessment of an optimization parameter in WLAN (wireless local area network) with access point and at least one platform, the method comprising the steps of:
Receive a trigger condition;
Determine an energy measuring to pardon a upper limit and a lower limit of limit (EDT) parameter;
Calculate this energy measuring and limit the value of parameter for this reason;
Limit parameter for this reason by this upper limit and this energy measuring of this lower limit; And
Upgrade this energy measuring and limit parameter for this reason.
2. method according to claim 1 is characterized in that existing when this trigger condition when the transmission packet error has transmitted through transmitting a packet error and a minimized number package above a target maximum.
3. method according to claim 1 is characterized in that this trigger condition exists when when the reception packet error has received through receiving packet error and minimized number package above the target maximum.
4. method according to claim 1 is characterized in that when a minimum interval has been crossed, a minimized number package has transmitted and a minimized number package when having received, this trigger condition exists.
5. method according to claim 1 is characterized in that this upper limit is to be determined by following formula:
Energy measuring is pardoned limit MAX=P STA-(RNG Base+ RNG Adj)
P wherein STABe the delivering power of this platform, RNG BaseBe a baseline scope of this access point, and RNG AdjIt is a scope adjusted value.
6. method according to claim 1 is characterized in that this lower limit equals access point receiver sensitivity position standard.
7. method according to claim 1 is characterized in that this calculation procedure comprises by following formula to calculate the value that this energy measuring is limit parameter for this reason:
Figure A2005800017480002C1
+ [ α PER Rx PER Rx MAX - β PER Tx PER Tx MAX + γ DR DR MAX ] Δ
PER wherein RxFor through receiving packet error, PER Rx MAXBe that a target maximum is through receiving packet error, PER TxFor through transmitting packet error, PER Tx MAXBe a target maximum through transmitting packet error, DR one passs rate, DR slowly MAXBe that a target maximum is passed rate slowly, Δ is a step size value, and reaching α, β, reaching γ is weight factor.
8. method according to claim 1 is characterized in that this calculation procedure comprises that calculating an energy measuring limits a delivery value and an energy measuring to limit the reception value for this reason for this reason.
9. method according to claim 8 is characterized in that it is to be calculated by following formula that this energy measuring is limit delivery value for this reason:
Figure A2005800017480002C3
Wherein DR one passs rate, DR slowly MAXBe that a target maximum is passed rate, PER slowly TxFor through transmitting packet error, PER Tx MaxBe a target maximum through transmitting packet error, Δ is a step size value, and γ and β are weight factor.
10. method according to claim 8 is characterized in that this energy measuring limits the reception value to equal a baseline scope of this access point for this reason.
11. method according to claim 8 is characterized in that it is to be calculated by following formula that this energy measuring is limit the reception value for this reason:
Wherein energy measuring is pardoned limit MAXBe that a ceiling capacity detects limit value for this reason, PER RxFor through receiving packet error, PER Rx MaxBe a target maximum through receiving packet error, and α is a weight factor.
12. method according to claim 1 is characterized in that this method is in each platform execution.
13. method according to claim 1 is characterized in that this method reaches a signal in this access point execution and should limit parameter to each platform of following this access point for this reason through upgrading energy measuring.
14. method according to claim 13 is characterized in that to limit parameter for this reason be each platform to following this access point of individually signaling through upgrading energy measuring for this.
15. method according to claim 13 is characterized in that this limits parameter for this reason through the renewal energy measuring is side by side to be broadcast to all platforms of following this access point.
16. one kind in the method with the clear wash rice channel assessment of optimization parameter in optimization platform and the WLAN (wireless local area network) through requiring platform, the method comprising the steps of:
From this optimization platform transmit a clear wash rice channel assessment parameter request to this through requiring platform;
Read wash rice channel assessment parameter clearly at this through requiring platform;
Report that through requiring platform this clear wash rice channel assessment parameter is to this optimization platform from this; And
Calculate new clear wash rice channel assessment parameter at this optimization platform.
17. method according to claim 16 is characterized in that further comprising step:
Notify this through requiring this new clear wash rice channel assessment parameter of platform.
18. method according to claim 16 is characterized in that this optimization platform is an access point; And
This is at least one platform through requiring platform.
19. method according to claim 16 is characterized in that this optimization platform is an access point; And
This is an access point through requiring platform.
20. method according to claim 16 is characterized in that this optimization station is a platform; And
This is at least one platform through requiring platform.
21. method according to claim 16 is characterized in that this optimization station is a platform; And
This is an access point through requiring platform.
22. the method for the clear wash rice channel assessment of an optimization parameter in the WLAN (wireless local area network) with access point and at least one platform, the method comprising the steps of:
Calculate the best clear wash rice channel assessment parameter of a platform at this access point;
Transmit a clear wash rice channel assessment parameter control request to this platform from this access point;
Determine this platform whether variable to this through asking clear wash rice channel assessment parameter, and change can be carried out as if this change in this clear wash rice channel assessment parameter of this platform; And
Transmit information to this this clear wash rice channel assessment parameter control request of access point response by this platform certainly.
23. the access point of the clear wash rice channel assessment of an optimization parameter in having the WLAN (wireless local area network) of at least one platform, this access point comprises:
One receiver;
One energy detector;
One channel availability determination device; And
One clear wash rice channel assessment calculation element, this access point receives input parameter and calculates this clear wash rice channel assessment parameter certainly.
24. the platform of the clear wash rice channel assessment of an optimization parameter in having the WLAN (wireless local area network) of access point, this platform comprises:
One receiver;
One energy detector;
One channel availability determination device; And
One clear wash rice channel assessment calculation element should receive input parameter and calculate this clear wash rice channel assessment parameter in the station certainly.
25. the integrated circuit of the clear wash rice channel assessment of an optimization parameter in WLAN (wireless local area network), it comprises:
One receiver;
One energy detector;
One channel availability determination device; And
One clear wash rice channel assessment calculation element receives input parameter and calculates this clear wash rice channel assessment parameter.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104349327A (en) * 2013-07-26 2015-02-11 智邦科技股份有限公司 Access point with capability of dynamically adjusting idle channel assessment threshold and operating method thereof
CN104869586A (en) * 2014-02-25 2015-08-26 中兴通讯股份有限公司 Dynamic channel detection processing method, site and access point equipment
CN105557055A (en) * 2013-09-13 2016-05-04 交互数字专利控股公司 Clear channel assessment (CCA) threshold adaptation method
CN106535345A (en) * 2015-09-15 2017-03-22 上海贝尔股份有限公司 Method for adjusting channel interception threshold value and base station
CN106797603A (en) * 2014-10-16 2017-05-31 高通股份有限公司 For the technology of energy measuring horizontal adjustment
CN107535005A (en) * 2015-05-05 2018-01-02 高通股份有限公司 Technology for dynamic sensitivity control
CN105075358B (en) * 2013-05-06 2019-01-15 英特尔公司 For providing the technology of flexible clear channel assessment (CCA) detection threshold value in the wireless network
CN110062475A (en) * 2014-04-11 2019-07-26 瑞昱半导体股份有限公司 Wireless communications method and device

Families Citing this family (80)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7403539B1 (en) * 2002-10-09 2008-07-22 Marvell International Ltd. Clear channel assessment in wireless communications
EP1680890A4 (en) * 2003-11-05 2009-06-24 Interdigital Tech Corp Quality of service management for a wireless local area network
US7443821B2 (en) * 2004-01-08 2008-10-28 Interdigital Technology Corporation Method for clear channel assessment optimization in a wireless local area network
US20050266803A1 (en) * 2004-06-01 2005-12-01 Nati Dinur Apparatus and methods for adaptation of signal detection threshold of a WLAN receiver
US8184655B2 (en) * 2005-04-21 2012-05-22 Interdigital Technology Corporation Wireless communication method and WLAN for signaling deferral management messages
US7801546B2 (en) * 2005-09-26 2010-09-21 Cisco Technology, Inc. Distributing configuration parameters in a high density network
US8045655B2 (en) 2005-11-03 2011-10-25 Samsung Electronics Co., Ltd. Apparatus and method for signal detection in a cognitive radio-based wireless communication system
US7623494B2 (en) * 2006-05-18 2009-11-24 Intel Corporation Adjustment of a clear channel assessment (CCA) threshold
KR101210335B1 (en) * 2006-09-15 2012-12-10 삼성전자주식회사 Method for implementing clear channel assessment function in wireless mesh network and mobile terminal thereof
US8774100B2 (en) * 2006-09-18 2014-07-08 Nokia Corporation Resource management techniques for wireless networks
US8050200B2 (en) * 2006-10-04 2011-11-01 Marvell World Trade Ltd. Opportunistic 40 MHz mode of transmission in wireless transmitters
US7760689B2 (en) * 2006-12-01 2010-07-20 Electronics And Telecommunications Research Institute Method and apparatus for generating link quality indicator information in MB-OFDM UWB system
KR100882358B1 (en) * 2006-12-01 2009-02-12 한국전자통신연구원 Method and apparatus for creating link quality indicator in mb-ofdm uwb system
CN101595761B (en) * 2007-01-24 2014-02-26 皇家飞利浦电子股份有限公司 Gathering and reporting data concerning communication channel conditions for a wireless device in a wireless network
JP5658658B2 (en) * 2008-04-30 2015-01-28 コーニンクレッカ フィリップス エヌ ヴェ Method for notifying a radio station of resources and radio station therefor
JP5060618B2 (en) * 2008-07-29 2012-10-31 パナソニック株式会社 Wireless communication apparatus and wireless communication control method
US8140017B2 (en) * 2008-09-29 2012-03-20 Motorola Solutions, Inc. Signal detection in cognitive radio systems
JP5180862B2 (en) * 2009-02-02 2013-04-10 パナソニック株式会社 Network system
WO2010128823A2 (en) * 2009-05-08 2010-11-11 Lg Electronics Inc. Method and apparatus for ascynchronous direct link setup in wlan system
US8463195B2 (en) * 2009-07-22 2013-06-11 Qualcomm Incorporated Methods and apparatus for spectrum sensing of signal features in a wireless channel
SG182371A1 (en) 2010-01-08 2012-08-30 Interdigital Patent Holdings Method and apparatus for channel resource mapping in carrier aggregation
JP5696292B2 (en) * 2011-08-09 2015-04-08 パナソニックＩｐマネジメント株式会社 Wireless communication device
CN103220065B (en) * 2012-01-18 2018-02-06 中兴通讯股份有限公司 The method of adjustment and device of clear channel assessment threshold
KR101984599B1 (en) * 2012-02-10 2019-05-31 엘지전자 주식회사 Method and apparatus for accessing channel in wlan system
US8885757B2 (en) 2012-05-29 2014-11-11 Magnolia Broadband Inc. Calibration of MIMO systems with radio distribution networks
US8649458B2 (en) 2012-05-29 2014-02-11 Magnolia Broadband Inc. Using antenna pooling to enhance a MIMO receiver augmented by RF beamforming
US8971452B2 (en) 2012-05-29 2015-03-03 Magnolia Broadband Inc. Using 3G/4G baseband signals for tuning beamformers in hybrid MIMO RDN systems
US8644413B2 (en) 2012-05-29 2014-02-04 Magnolia Broadband Inc. Implementing blind tuning in hybrid MIMO RF beamforming systems
US8767862B2 (en) 2012-05-29 2014-07-01 Magnolia Broadband Inc. Beamformer phase optimization for a multi-layer MIMO system augmented by radio distribution network
US9154204B2 (en) 2012-06-11 2015-10-06 Magnolia Broadband Inc. Implementing transmit RDN architectures in uplink MIMO systems
EP2915382B1 (en) * 2012-11-02 2017-05-31 Interdigital Patent Holdings, Inc. Power control methods and procedures for wireless local area networks
US9343808B2 (en) 2013-02-08 2016-05-17 Magnotod Llc Multi-beam MIMO time division duplex base station using subset of radios
US8797969B1 (en) 2013-02-08 2014-08-05 Magnolia Broadband Inc. Implementing multi user multiple input multiple output (MU MIMO) base station using single-user (SU) MIMO co-located base stations
US8989103B2 (en) 2013-02-13 2015-03-24 Magnolia Broadband Inc. Method and system for selective attenuation of preamble reception in co-located WI FI access points
US9155110B2 (en) 2013-03-27 2015-10-06 Magnolia Broadband Inc. System and method for co-located and co-channel Wi-Fi access points
US20140226740A1 (en) 2013-02-13 2014-08-14 Magnolia Broadband Inc. Multi-beam co-channel wi-fi access point
US9100968B2 (en) 2013-05-09 2015-08-04 Magnolia Broadband Inc. Method and system for digital cancellation scheme with multi-beam
US9492741B2 (en) 2013-05-22 2016-11-15 Microsoft Technology Licensing, Llc Wireless gaming protocol
CN103278990B (en) 2013-05-28 2017-08-25 京东方科技集团股份有限公司 Dot structure and liquid crystal panel
US9883404B2 (en) * 2013-06-11 2018-01-30 Qualcomm Incorporated LTE/LTE—A uplink carrier aggregation using unlicensed spectrum
US9425882B2 (en) 2013-06-28 2016-08-23 Magnolia Broadband Inc. Wi-Fi radio distribution network stations and method of operating Wi-Fi RDN stations
US8995416B2 (en) * 2013-07-10 2015-03-31 Magnolia Broadband Inc. System and method for simultaneous co-channel access of neighboring access points
US9497781B2 (en) 2013-08-13 2016-11-15 Magnolia Broadband Inc. System and method for co-located and co-channel Wi-Fi access points
US9949292B2 (en) * 2013-09-11 2018-04-17 Qualcomm Incorporated Coupling uplink and downlink CCA in LTE-U
US9088898B2 (en) 2013-09-12 2015-07-21 Magnolia Broadband Inc. System and method for cooperative scheduling for co-located access points
US9060362B2 (en) * 2013-09-12 2015-06-16 Magnolia Broadband Inc. Method and system for accessing an occupied Wi-Fi channel by a client using a nulling scheme
US9172454B2 (en) 2013-11-01 2015-10-27 Magnolia Broadband Inc. Method and system for calibrating a transceiver array
US8891598B1 (en) 2013-11-19 2014-11-18 Magnolia Broadband Inc. Transmitter and receiver calibration for obtaining the channel reciprocity for time division duplex MIMO systems
US8929322B1 (en) 2013-11-20 2015-01-06 Magnolia Broadband Inc. System and method for side lobe suppression using controlled signal cancellation
US8942134B1 (en) 2013-11-20 2015-01-27 Magnolia Broadband Inc. System and method for selective registration in a multi-beam system
US9294177B2 (en) 2013-11-26 2016-03-22 Magnolia Broadband Inc. System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems
US9014066B1 (en) 2013-11-26 2015-04-21 Magnolia Broadband Inc. System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems
US9042276B1 (en) 2013-12-05 2015-05-26 Magnolia Broadband Inc. Multiple co-located multi-user-MIMO access points
US10341890B2 (en) 2013-12-13 2019-07-02 Qualcomm Incorporated CSI feedback in LTE/LTE-advanced systems with unlicensed spectrum
US9100154B1 (en) 2014-03-19 2015-08-04 Magnolia Broadband Inc. Method and system for explicit AP-to-AP sounding in an 802.11 network
US9172446B2 (en) 2014-03-19 2015-10-27 Magnolia Broadband Inc. Method and system for supporting sparse explicit sounding by implicit data
US9271176B2 (en) 2014-03-28 2016-02-23 Magnolia Broadband Inc. System and method for backhaul based sounding feedback
WO2015174725A1 (en) 2014-05-13 2015-11-19 주식회사 윌러스표준기술연구소 Wireless communication method for allocating clear channel, and wireless communication terminal using same
US9743363B2 (en) 2014-06-24 2017-08-22 Qualcomm Incorporated CCA clearance in unlicensed spectrum
US10251198B2 (en) 2014-06-26 2019-04-02 Telefonaktiebolaget Lm Ericsson (Publ) Clear channel assessment threshold configuration
KR102148654B1 (en) * 2014-08-06 2020-10-14 엘지전자 주식회사 Multiuser frame transmission method in wireless lan system
KR102054117B1 (en) 2014-08-18 2019-12-09 주식회사 윌러스표준기술연구소 Wireless communication method for simultaneous data communication, and wireless communication terminal using same
WO2016029342A1 (en) * 2014-08-25 2016-03-03 华为技术有限公司 Method for adjusting clear channel assessment threshold, and access point
WO2016038762A1 (en) 2014-09-12 2016-03-17 日本電気株式会社 Wireless station, wireless terminal and method thereof
WO2016038763A1 (en) 2014-09-12 2016-03-17 日本電気株式会社 Wireless station, wireless terminal and method for terminal measurement
US10045302B2 (en) 2014-09-16 2018-08-07 Qualcomm Incorporated Power control in wireless networks
WO2016072815A1 (en) * 2014-11-07 2016-05-12 Samsung Electronics Co., Ltd. Method and apparatus for transmitting data
CN112637967B (en) 2014-12-02 2024-03-22 韦勒斯标准与技术协会公司 Wireless communication terminal and wireless communication method for idle channel allocation
JP6790830B2 (en) 2014-12-25 2020-11-25 日本電気株式会社 Radio terminals, radio stations, and the methods performed by them
US10462799B2 (en) 2015-01-30 2019-10-29 Telefonaktiebolaget Lm Ericsson (Publ) First node and a method therein
CN107251639A (en) 2015-02-10 2017-10-13 瑞典爱立信有限公司 Receiving node, transmission node and method therein for handling channel access
WO2016156766A1 (en) * 2015-03-31 2016-10-06 Toshiba Research Europe Limited Ap coordinated dynamic sensitivity control in 802.11 stations
US10159108B2 (en) * 2015-04-10 2018-12-18 Motorola Mobility Llc DRX handling in LTE license assisted access operation
US10349293B2 (en) * 2015-04-17 2019-07-09 Qualcomm Incorporated Control of UE clear channel assessment by an eNB
KR102328669B1 (en) * 2015-05-07 2021-11-19 삼성전자주식회사 Apparatus and method for transmitting/receiving signal in wireless communication system supporting unlicensed band
EP3335509B1 (en) 2015-08-11 2020-11-11 Telefonaktiebolaget LM Ericsson (publ) Method used in radio node, radio node and computer program product
CN107926043B (en) * 2015-09-01 2020-06-02 华为技术有限公司 Method and device for determining spatial multiplexing
US9980233B2 (en) * 2015-12-17 2018-05-22 Qualcomm Incorporated Power control for uplink transmissions
WO2018016167A1 (en) * 2016-07-19 2018-01-25 ソニー株式会社 Wireless communication device and wireless communication method
US11357047B2 (en) * 2020-05-13 2022-06-07 Qualcomm Incorporated Adaptive detection threshold for contention-based channel access

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5412686A (en) 1993-09-17 1995-05-02 Motorola Inc. Method and apparatus for power estimation in a communication system
JP3432048B2 (en) 1995-07-13 2003-07-28 キヤノン株式会社 Communication device
US5940400A (en) 1996-11-06 1999-08-17 Motorola, Inc. Method, device, wireless transceiver and computer for providing collision detection in wireless carrier sense multiple access systems
US6067291A (en) 1997-09-23 2000-05-23 Lucent Technologies Inc. Wireless local area network with enhanced carrier sense provision
JP3097078B2 (en) 1998-07-21 2000-10-10 日本電気株式会社 Wireless packet communication device
US6891847B1 (en) 1998-09-11 2005-05-10 Share Wave, Inc. Method and apparatus for accommodating asynchronous data transmissions in a wireless computer network
US6876858B1 (en) 1999-01-20 2005-04-05 Lojack Operating Company, Lp Methods of and system for portable cellular phone voice communication and positional location data communication using the cellular phone network control channel
US6381570B2 (en) * 1999-02-12 2002-04-30 Telogy Networks, Inc. Adaptive two-threshold method for discriminating noise from speech in a communication signal
US6469997B1 (en) * 1999-05-03 2002-10-22 Motorola, Inc. Method for transmitting collision-free messages in a digital selective call signaling protocol
CN1146278C (en) * 1999-08-30 2004-04-14 华为技术有限公司 Method for estimating interference level to idle channel in cellular mobile communication system
US7411921B2 (en) * 1999-10-21 2008-08-12 Rf Technologies, Inc. Method and apparatus for integrating wireless communication and asset location
US20030016647A1 (en) 2000-01-13 2003-01-23 Kenneth Margon System and method for multipoint to multipoint data communication
EP1139606A1 (en) * 2000-03-28 2001-10-04 Lucent Technologies Inc. Wireless communication in a lan with varying signal level thresholds
US6985465B2 (en) * 2000-07-07 2006-01-10 Koninklijke Philips Electronics N.V. Dynamic channel selection scheme for IEEE 802.11 WLANs
US6748234B1 (en) 2000-11-21 2004-06-08 Qualcomm Incorporated Method and apparatus for power control in a wireless communication system
US6675012B2 (en) 2001-03-08 2004-01-06 Nokia Mobile Phones, Ltd. Apparatus, and associated method, for reporting a measurement summary in a radio communication system
CA2564178C (en) 2001-03-08 2009-06-02 Nokia Corporation Apparatus, and associated method, for reporting a measurement summary in a radio communication system
EP1257090B1 (en) * 2001-05-08 2004-11-17 Lucent Technologies Inc. Wireless LAN with dynamic frequency selection
US7206840B2 (en) * 2001-05-11 2007-04-17 Koninklike Philips Electronics N.V. Dynamic frequency selection scheme for IEEE 802.11 WLANs
US7280615B2 (en) * 2002-02-20 2007-10-09 Freescale Semiconductor, Inc. Method for making a clear channel assessment in a wireless network
US7366144B2 (en) * 2002-03-25 2008-04-29 Agere Systems Inc. Method of dynamically setting at least one threshold at an access point in a wireless local area network and the access point
DE60317810T2 (en) * 2002-10-03 2008-10-30 Interdigital Technology Corp., Wilmington DETERMINATION OF THE CODE TRANSMISSION RANGE IN THE CIRCULATION POWER FOR CELLULAR SYSTEMS
US7203459B2 (en) * 2003-04-03 2007-04-10 Pctel, Inc. Mode adaptation in wireless systems
US7443821B2 (en) * 2004-01-08 2008-10-28 Interdigital Technology Corporation Method for clear channel assessment optimization in a wireless local area network
US20050266803A1 (en) 2004-06-01 2005-12-01 Nati Dinur Apparatus and methods for adaptation of signal detection threshold of a WLAN receiver

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105075358B (en) * 2013-05-06 2019-01-15 英特尔公司 For providing the technology of flexible clear channel assessment (CCA) detection threshold value in the wireless network
US9780925B2 (en) 2013-07-26 2017-10-03 Accton Technology Corporation Access point with capability of dynamically adjusting current clear channel assessment threshold value and operating method thereof
CN104349327A (en) * 2013-07-26 2015-02-11 智邦科技股份有限公司 Access point with capability of dynamically adjusting idle channel assessment threshold and operating method thereof
CN105557055A (en) * 2013-09-13 2016-05-04 交互数字专利控股公司 Clear channel assessment (CCA) threshold adaptation method
CN105557055B (en) * 2013-09-13 2019-08-16 交互数字专利控股公司 Clear channel assessment (CCA) (CCA) threshold adaptation method
CN104869586B (en) * 2014-02-25 2019-11-05 中兴通讯股份有限公司 A kind of processing method and access point apparatus of dynamic channel detection
CN104869586A (en) * 2014-02-25 2015-08-26 中兴通讯股份有限公司 Dynamic channel detection processing method, site and access point equipment
CN110062475B (en) * 2014-04-11 2021-01-12 瑞昱半导体股份有限公司 Wireless communication method and device
CN110062475A (en) * 2014-04-11 2019-07-26 瑞昱半导体股份有限公司 Wireless communications method and device
CN106797603A (en) * 2014-10-16 2017-05-31 高通股份有限公司 For the technology of energy measuring horizontal adjustment
CN107535005A (en) * 2015-05-05 2018-01-02 高通股份有限公司 Technology for dynamic sensitivity control
CN106535345B (en) * 2015-09-15 2020-02-28 上海诺基亚贝尔股份有限公司 Method for adjusting channel interception threshold and base station
CN106535345A (en) * 2015-09-15 2017-03-22 上海贝尔股份有限公司 Method for adjusting channel interception threshold value and base station

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AR047183A1 (en) 2006-01-11
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EP1714425A4 (en) 2012-01-18
TWI308437B (en) 2009-04-01
US7620063B2 (en) 2009-11-17
US20100067473A1 (en) 2010-03-18
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WO2005069873A3 (en) 2006-11-02
EP2861013A1 (en) 2015-04-15
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US7443821B2 (en) 2008-10-28
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KR100759302B1 (en) 2007-09-18
CN1977479B (en) 2012-01-25
CA2552774A1 (en) 2005-08-04
KR20050095563A (en) 2005-09-29
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US20090003299A1 (en) 2009-01-01
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